Hi @Markus,
I’m sorry for my prolonged absence.
I see that this type of issue (“Cannot regenerate session id”) occurs from time to time with osTicket.
I would suggest upgrading to a newer osTicket Awesome release, which (with any luck) may contain a fix in the core osTicket code.
Otherwise here are a few tips that I have gleaned from a search of the osTicket forum:
The PHP warnings seem to indicate that your server has an issue with sessions. I’m going to guess that you are using a webhosting company and if I’m right I would recommend that you talk to your host and see if they can shed any light on the issue. It might be something like SELinux or mod_security and they would need to check their webserver logs to tell you what the actual issue is, and if there is a solution.
…you will want to check your Apache access and error logs as well as your php error logs (if not combined) and see if there is anything logged there.The most common causes are:
wrong file/directory permissions or ownership
a misconfigured .htaccess